1. Identifying Accurate Crack Initiation and Propagation Thresholds in Siliceous Siltstone and Limestone.
- Author
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Zhang, Xiao-Ping, Lv, Gen-Gen, Liu, Quan-Sheng, Wu, Shun-Chuan, Zhang, Qi, Ji, Pei-Qi, and Tang, Xu-Hai
- Subjects
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ACOUSTIC emission , *POISSON'S ratio , *SILTSTONE , *ROCK deformation , *LIMESTONE , *STRESS-strain curves - Abstract
However, the value of crack closure stress ( I i SB cc sb ) and crack initiation stress ( I i SB ci sb ) will be clearly changed by small fluctuations of Poisson's ratio. If the stress level is higher than the crack damage stress ( I i SB cd sb ) but lower than peak strength ( I i SB f sb ), cracks will propagate continuously and coalescence to reach macroscopic failure. 6 Curves of lateral strain difference for a siliceous siltstone and b limestone Moving Point Regression Method (MPR) Eberhardt et al. ([4]) proposed a new method to obtain the crack closure stress ( I i SB cc sb ) and the crack initiation stress ( I i SB ci sb ). If the stress level is higher than crack initiation stress ( I i SB ci sb ) but lower than crack damage stress ( I i SB cd sb ), cracks randomly initiated but they will cease at a certain length without coalescence. [Extracted from the article]
- Published
- 2021
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